81650955 has 8 divisors (see below), whose sum is σ = 130641552. Its totient is φ = 43547168.

The previous prime is 81650953. The next prime is 81650969. The reversal of 81650955 is 55905618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81650955 - 2¹ = 81650953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81650953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2721684 + ... + 2721713.

It is an arithmetic number, because the mean of its divisors is an integer number (16330194).

Almost surely, 2^81650955 is an apocalyptic number.

81650955 is a deficient number, since it is larger than the sum of its proper divisors (48990597).

81650955 is a wasteful number, since it uses less digits than its factorization.

81650955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5443405.

The product of its (nonzero) digits is 54000, while the sum is 39.

The square root of 81650955 is about 9036.0917990025. The cubic root of 81650955 is about 433.8308411527.

The spelling of 81650955 in words is "eighty-one million, six hundred fifty thousand, nine hundred fifty-five".